Bobbin and method of making the same



March 20, 1934. P, MULLER 1,951,556

BOBBIN AND METHOD OF MAKING THE SAME Filed March 1, 1933 14/ U 5 ii "irl Z if y- ATTORNEY Patented Mar. 20, 1934 PATENT OFFICE BOBBIN ANDMETHOD OF MAKING THE SAME Paul P. Muller, Paterson, N. J.

Application March 1, 1933, Serial No. 659,092

8 Claims.

This invention relates to spools, bobbins and the like (hereinaftertermed bobbins) and particularly to that class of such devices in whichthe barrel and its head or heads are assembled parts. The object is toprovide, at the minimum of expense, for greater durability and strengththan bobbins of this class usually have and in particular to insure thatthe head or heads shall .be so firmly secured to the barrel as to bepractically integral therewith, this being very desirable where in thedrying of wet silk yarn wound thereon the bobbin has to withstand greatlongitudinal pressure of the wound mass as, in the drying, its windingscontract and so set up suchpressure. The improved bobbin herein setforth has shown in testing apparatus the ability to withstand a pressureexerted outward against the head of as much as 1800 lbs., and even atthat pressure the head would become bent before its anchorage to thebarrel would give way. Further, the construction is such that the partsare secure against coming apart due to rough handling or the shrinkageof the selected wood or equivalent material employed, even after longservice. Thus the improved bobbin is superior to any bobbin heretoforeknown tome.

In the drawing,

Fig. 1 shows partly in side elevation and partly in section one form ofa bobbin according to this invention, the assembly at its lower endbeing shown complete and at its upper end partially effected;

Fig. 2 is an end View of the bobbin;

Fig. 3 is a transverse sectional view of one of its heads and anattaching collar therefor;

Fig. 4 is a sectional view of one end of another form of the bobbin inpartially assembled state;

Fig. 5 is an inside view of the head and collar of such form; and

Fig. 6 a transverse sectional view of the latter head and collar.

1 is a barrel, which may be of some more or less yielding material, aswood, having its bore 2 enlarged at each end, as at 3, and having ateach end an integral projection 4 concentric with the bore and thusannular and in the example formed by providing a channel 5, alsoconcentric with the bore, in the end of the barrel and removing materialof the barrel outwardly of the channel for a portion only of its depth,or for a depth equal to the thickness of the head.

Each head is formed as a disk 6, here of fiber, centrally apertured at7.

At 8 is a cylindrical collar of substantially unyielding material, asmetal, having in its aperture what I term inward impression-formingmeans adapted to impress and form an interlock with the barrel. Suchmeans in Figs. 1 to 3 is screw-threading 9, and in Figs. 4 to 6 it isinternal ribs 10, preferably interrupted at 11 and in such manner thatthe interruption in any one rib is offset with relation to that of thenext rib. The collar has at one end an exterior flange 12 which, bynotching the flange at intervals, as at 13, affords peripheral keys.Each head and its collar may be assembled to form a flange-formingstructure for the bobbin by subjecting these parts to pressure, with thecollar in the aperture of the head, and so that the mentioned keys embedthemselves in the head and remain lapping it as shown.

If the flange-forming or head-including structure is of the type ofFigs. 1 to 3 it may be first screwed onto the projection 4, cutting itsown thread, at least to partial depth as shown in Fig. 1. If it is ofthe type of Figs. 4 to 6 it is slipped over the head, which itpreferably should, however, snugly fit In either case it bears againstthe end face of the barrel around the projection.

14 is a plug having a cylindrical head 14a. of somewhat greater diameterthan the barrel bore at 3, a downward taper 14b next below the head andan axial bore 140. This plug has such diameter that when employed aswill appear-it will cause yielding of the material of the barrel.-

When' the flange-forming structure 6-8 has been assembled with thebarrel as stated the plug is introduced to the barrel bore at 3anddriven home, or so that its head 14a enters the bore. Thereby theplug (to wit, its head) presses the annular projection 4 radiallyoutward against the collar, preferably to such an extent that saidprojection is not only compressed and compacted between the plug and theribs (thus impressing the ribs in portion 4 and setting up a positiveinterlock between said portion and the collar) but between said portionand the cylindrical surface portions of the collar lying between itsribs, its general thickness being reduced as may be seen by a comparisonof the upper and lower ends of the bobbin in Fig. 1. In fact, anenlarging distortion or expansion of the portion 4 actually takes place(even where the collar is threaded and initially screwed onto thebarrel, provided its threads do not enter the barrel material their fulldepth), as also shown in Fig. 1 at the bottom, but if for the barrelsome tough material, such as maple wood commonly used for the purpose,is employed this distortion occurs without disrupting the connectionbetween the portion 4 and the body of they barrel.

My invention distinguishes in the following respects' from bobbins ofits class in which the displacement of the bored end of the barrel intopressing relation to the flange-forming structure embracing said end isdepended on to unite them:

When such an expander as the portion 14a of the element 14. is driveninto the bored end of the barrel it progressively expands tosubstantially the same extent and into gripping relation to the aperturesurface of the flange-forming structure the portions of said end lyingin the succes sive planes through which the expander. passes and whichare within the zone of said structure. The impression forming meanscomes into action to form the interlock by a novel radial displacementof the barrel end,.which is alreadya in telescoped relation to thecollar, as distinct from a scoring or grooving action incident toforcing one. of these parts into telescoped. relation to the other.

The pressure developed is a material factor in resisting: displacementof the collar rotatively as wellas axially, though. if. the interruptedvribs 10-01 Figs..4 to. 6 beusedthe pressure causes the material ofportion. 4 to be impressed. into; the interruptions 11,. establishingv apositive interlock or. obstruction against such rotarydisplacement.

It has-been proposed inthis art to employ a flange-forming. structurehaving a collar receiving a portion of the barrel, but not, sofar as Iam aware,.where the collar coact's with. a plug or equivalent ashereinset forth.

When the plug is. to be introduced it. may diesirably be coated withglue..

, It. is notindispensable that the. parts of. the flange-forming.structure be united. with the barrel, as a pre-formed assembly, as.herein described.

Having thusfully described-my invention what I claim is:

1-. The herein-described method. of vfixedly uniting, with a bobbinbarrel having ayielding bored end, a flange-forming structure having. asubstantially unyielding apertured. center. portion in telescopedrelationt'osaid.end.and.,im.- pression-forming means in the apertureproject.- ing toward said end which consists in. radially displacingsaid end circumferentiallythereof untilit is impressed by said means.

end, a flange-forming structure having a substantially unyieldingapertured center portion receiving said end and inwardimpression-forming means in its aperture which consists in driving intothe bore of said end in frictionally retained relation thereto a plughaving such diameter and compression-resistance as to expand said enduntil it is impressed by said means.

4. A1 bobbin comprising: a. barrel of yielding material having a boredend; an ap'ertured head 8| having its aperture receiving said end, asubstantially unyielding collar in said aperture and receiving said end,said collar and barrel having means to limit' displacement of the headlengthwise of the barrel in each direction, and a plug driven. into thebore of said end and having a portion in the zone of the head holdingsaid end pressed radially outwardly against the collar.

5. A bobbin comprising a barrel of yielding material having a bored end,an apertured head havingits aperture receiving said. end, an unyieldingcollar in said aperture and re'ceivingsaid end and having in. itsaperture inwardimpression forming means, said collar and barrel havingmeans to limitdisplacement of the head lengthwise of'the barrel in eachdirection; and a plug. driven into the bore of saidzend and having aportion in'the" zone of the headhol'cling saidien'd pressedra'dially'outwardly against said means and impressed by" the same. 1

6; Thehereindescribed method of fixedly unit ing, with a bobbin barrelof yielding material having a bored end, aniapertured' fian'ge forming"structure receiving, said end in its aperture which. consists. in.forcing into the bore of said no end and through the zone.of"saidstructurean-ex pander having such diameter as progressivel'y'toexpand to substantially the same extent and ihto'- gripping, relation tothe aperture surfaceof said structure portionsofsaidend'lyingiinthesucces-qu sive planes through which the expanderip'asses withinsaidzone.

7;. The herein-described bobbin. comprising a barrel of expansib'le'material and an annular flange-forming, structure embracing" one" endof" 1 the barrel; said end being expanded to substane tially the same"extent in various" planesperpendicular to the axis of the barrel and"within the zone ofjsaid structure and" into grippingrelation to thelatter.

8; I he herein-described bobbin comprising a barrel of"expansiblematerial; an annular flange; forming structure embracing one end of thebar-- rel, saidend" being expanded to substantiahythe same extent. invarious. planes'perpendicula'r to the axis of the barrel and Within?the" zone-of said structure and into gripping relationtdthe latter and ap'l'ug 'i'n said end maintaining the'sameex panded;

PAUE P. MULLER. 13

